Ampharetidae Malmgren 1866

• Main Authors: Schiaparelli, Stefano, Jirkov, Igor A.
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2021
• Subjects: Biodiversity; Taxonomy; Animalia; Annelida; Polychaeta; Terebellida; Ampharetidae; Antarc*; Antarctic; Antarctica
• Online Access: https://doi.org/10.5281/zenodo.4531817; http://treatment.plazi.org/id/03A8045EF717FFDE53F7F20EFA826DBA

Key to Ampharetidae genera occurring in Antarctica In order to simplify the task of genera recognition of not trained people we have assembled a dichotomic key hoping that this would speed the recognition of the different Antarctic ampharetid genera. 1. Three or four anterior segments with vertical rows of minute acicular chaetae. Melinninae Chamberlin, 1919.2 – Minute acicular chaetae absent. Ampharetinae Malmgren, 1866 …3 2. Hooks (usually one pair) and dorsal crest (usually one and dentate) behind the branchiae present. Melinna Malmgren, 1866 – Hooks absent, dorsal crest present. Melinnides Wesenberg-Lund, 1950 (= Melinnantipoda ) – Hooks and dorsal crest absent. Melinnopsis McIntosh, 1885 (= Amelinna , Melinnexis , Melinnopsides ) 3. Buccal tentacles attached outside the mouth, methylene blue staining pattern of ventral glandular shields well marked. Noanelia Desbruyères & Laubier, 1977 – Buccal tentacles attached inside the mouth (seldom may be everted), methylene blue staining pattern of ventral glandular shields poor marked. 4 4. Prostomium Amphicteis -like: with prominent straight transversal nuchal ridges; middle lobe anteriorly more of less incised, usually with pair of longitudinal ridges; rudimental notopodia AU1 several times smaller than normal thoracic. Amphicteis Grube, 1850 – Prostomium Ampharete or Amage -like: trilobed, without prominent nuchal organs or ridges; middle lobe anteriorly rounded; rudimental notopodia AU1 several times smaller normal thoracic or absent. 5 – Prostomium without lobes, without prominent nuchal organs or ridges. 13 5. Middle lobe of prostomium anteriorly incised or with horns (Fig. 1 A–B). 6 – Middle lobe of prostomium anteriorly rounded or pointed. 8 6. Abdominal neuropodia with very long cirri, longer than width of segment. Samythopsis McIntosh, 1885 (= Neopaiwa , Paiwa , Weddelia ) – Abdominal neuropodial cirri, if present much shorter than width of segment (Fig. 1G). 7 7. All abdominal neuropodia, including AU1 pinnuli (Fig. 1G), no more than 16 AU. Amage ...